Title :
Space-time processing with a decoupled delayed decision-feedback sequence estimator
Author :
de Almeida, A.L.F. ; Panazio, C.M. ; Cavalcanti, F.R.P. ; Fernandes, C.E.R.
Author_Institution :
Wireless Telecom Res. Group, Fed. Univ. of Ceara, Fortaleza, Brazil
fDate :
6/24/1905 12:00:00 AM
Abstract :
This work aims at investigating the performance of a decoupled space-time processing structure based on a delayed decision-feedback sequence estimator (D-ST-DDFSE), in the context of the Enhanced Data rates for GSM Evolution (EDGE) system. The main idea in using decoupled space-time (D-ST) processing structures is to separate co-channel interference (CCI) reduction from intersymbol interference (ISI) suppression. Consequently, all degrees of freedom of a space-time (ST) front-end are dedicated to treat CCI, leaving ISI to be suppressed by a temporal equalizer. Due to the 8-PSK modulation and the large delay spread values compared to the symbol period, optimum detection becomes too complex in the EDGE system, which makes DDFSE a promising scheme for ISI suppression. The performance of D-ST-DDFSE is analyzed through link-level simulations under the context of COST 259 channel models for typical urban (TU) and bad urban (BU) propagation scenarios. Improved performance of this D-ST technique over a space-time linear equalizer is observed.
Keywords :
cellular radio; cochannel interference; data communication; decision feedback equalisers; interference suppression; intersymbol interference; packet radio networks; phase shift keying; radiowave propagation; sequential estimation; 8-PSK modulation; CCI reduction; COST 259 channel models; D-ST-DDFSE; EDGE system; Enhanced Data rates for GSM Evolution; ISI suppression; bad urban propagation; co-channel interference; decoupled space-time processing; delay spread values; delayed decision-feedback sequence estimator; high-data rate mobile communications; intersymbol interference; link-level simulations; optimum detection; performance analysis; typical urban propagation; Analytical models; Context modeling; Costs; Delay estimation; Equalizers; GSM; Interchannel interference; Intersymbol interference; Performance analysis; Radiofrequency interference;
Conference_Titel :
Vehicular Technology Conference, 2002. VTC Spring 2002. IEEE 55th
Print_ISBN :
0-7803-7484-3
DOI :
10.1109/VTC.2002.1002819
